Telescopic shroud for use with oil burning equipment



J. MCDONALD May 25, 1937.

TELESCOPIC SHROUD FOR USE vWITH OIL BURNING EQUIPMENT Filed Jan. 21,

ATTORN EY Patented May 25, 1937 UNITED STATES PATENT OFFICE TELESCOPIC SHROUD FOR USE WITH OIL BURNING EQUIPMENT Application January 21, 1937, Serial No. 121,408

1 Claim.

In liquid fuel atomizing burners of the Todd type, employing a flame cone or diffuser, it is found that the separate currents of .air flowing respectively, rearwardly toward the furnace opening, and inwardly through the register wall with a whirling motion imparted by means of curved vanes stationed at or constituting said wall, will intersect due to deflection of the rearwardly directed currents from the outer surface of the cone, and thereby set up a turbulent condition which nulliiies the whirling motion that had been imparted to these air supplies. In consequence the air streams fail to blend properly with the atomized fuel, resulting in inefficient combustion. Therefore, the purpose of my invention is to provide means whereby the rearwardly directed streams of air striking against the flame cone will be prevented from deilecting into the path of other air streams entering through the register wall. To this end I provide a cylindrical member which is attached to the flame cone at its perimeter and which extends forwardly therefrom to form a surrounding wall or shroud which serves as a guard or shield to prevent rearwardly directed air streams, that would normally strike the outer surface of the cone from deflecting therefrom into the path of the air streams entering the register. This shrouding means is preferably made telescopic because the llame cone which is carried by the burner casing is adjustable axially therewith in usual liquid fuel burning practice, so that another cylindrical member, held in fixed relation, is provided to enter slidably within the cone carried member, whereby, in telescopic action, the fixed shroud member Will continue to prevent dellection of air currents fro-m the cone as the cone carried member is moved rearwardly.

Other features and advantages of my invention will hereinafter appear.

In the drawing:

Figure 1 is a side sectional view of an air register, showing the rearward portion of a burner, casing therefor, and flame cone attached to said casing, also showing my improved telescopic shroud to prevent deflection of air currents from said flame cone, and

(Cl. 15S-1.5)

Fig. 2 is a section on the line 2-2 of Fig. 1.

In said views let l indicate a boiler front plate, 2 the usual Venturi ring at the furnace entrance, 3, posts, and 4 adjustable vanes which form the surrounding wall o-f the register, and 5 the front plate of the register. Said front plate has openings 6 therethrough, which may be provided with adjustable Vanes (not herein shown) for controlling the rearward flow of air through said openings. Projecting through said register front plate is a burner 'l (only the rearward portion thereof appearing in the drawing) and surrounding the burner is the burner casing 8, to which is attached a flame cone or diffuser 9. Secured to plate 5 is the base I0, which may be dished as as shown, of a shroud-like member having a cylindrical wall Il, which surrounds the forward portion of the flame cone. In telescopic relation to said wall Il is a cylindrical member I2 that is carried by the llame cone, being attached to said cone at the perimeter of the latter. The dished base I0 of the inner shroud member may be provided with apertures, as at I3, for the flow of air to the flame cone. It is obvious the shroud serves as a guard to prevent air currents striking the outer surface of the cone from being deflected into the path of other currents that enter through the register, this feature constituting the essence of the present invention.

Variations within the spirit and scope of my invention are equally comprehended by the foregoing disclosure.

I claim:

The combination with a furnace having an opening in its wall, a fuel burner positioned in front of said opening, an axially adjustable flame cone carried by the front end of said burner, and air supply means surrounding said flame cone, of a cylindrical member carried by the perimeter of said flame cone and extending rearwardly from said opening to prevent outward deflection of air currents flowing toward the furnace opening and striking said flame cone, and a second cylindrical member in fixed relation to said air supply means and telescoping with said rst-narned cylinder during axial adjustment of said flame cone.

JAMES MCDONALD. 

